[llvm] [JITLink][AArch64] Implement R_AARCH64_LDR_PREL_LO19 (PR #82172)

[Eymen Ünay via llvm-commits]

https://github.com/eymay commented:

Thanks for working on this. I am not very familiar with AArch64 specifics but generally looks good to me.

https://github.com/llvm/llvm-project/pull/82172